I got split-screen editing working in Maud. I can work on two models at once or, as shown here, I can work with two different views of the same model. The 3-D view on the right side renders the model at a particular instant. The 2-D view on the left plots significant keyframes (in the selected bone, its ancestors, and its children) against time.

Maud is now at a point where I'd appreciate some constructive feedback. Later today I'll post a call for volunteers (alpha testers) on the Forum.

My Maud editor for animated models is now at a point where I'd appreciate constructive feedback. I'm seeking a few brave JME users to act as alpha testers.
The project (including documentation) is online at https://github.com/stephengold/Maud
I haven't figured out how I will distribute Maud pre-built, so for now users must build it from source. The documentation explains (in great detail) how to do that using the IDE. The documentation also tries to explain how to use Maud; please read those…

Wow that's pretty cool... Do you export the textures, or did you find a way to read the subsar?Would be pretty cool to be able to read subsar in JME as material source... You should post on Allegorithmic's forum once you have a deliverable solution.

I just finished an objective system for my game and added a simple escort quest, although there's still some un-animated and incomplete things you'll probably notice. I didn't make a model for the NPC that you escort, so for now you just escort an un-animated copy of yourself

Huge thanks to @pspeed for the trees and his amazing SimArboreal editor